From 062d6bb9b0698c99fa18985bd702caffc6731e63 Mon Sep 17 00:00:00 2001
From: Ken Polizzi <ken.polizzi@jaguar-network.com>
Date: Wed, 21 Sep 2022 16:20:01 +0200
Subject: [PATCH] one less substraction on undo

---
 h-m-m | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/h-m-m b/h-m-m
index e826464..1b36472 100755
--- a/h-m-m
+++ b/h-m-m
@@ -1805,9 +1805,9 @@ function undo(&$mm)
 	if($mm['change_index'] == 0)
 		return;
 
-	$mm['nodes'] = $mm['changes'][$mm['change_index'] - 1];
-	$mm['active_node'] = $mm['change_active_node'][$mm['change_index'] - 1];
 	$mm['change_index']--;
+	$mm['nodes'] = $mm['changes'][$mm['change_index']];
+	$mm['active_node'] = $mm['change_active_node'][$mm['change_index']];
 
 	build_map($mm);
 	display($mm);